US 12,312,442 B2
Method for separating organic zinc catalyst using filtering membrane
Kyung Min Min, Daejeon (KR); Sung Kyoung Kim, Daejeon (KR); Seung Young Park, Daejeon (KR); and Sang Cheol Shin, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 16/973,692
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Dec. 19, 2019, PCT No. PCT/KR2019/018131
§ 371(c)(1), (2) Date Dec. 9, 2020,
PCT Pub. No. WO2020/130686, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10-2018-0165219 (KR), filed on Dec. 19, 2018.
Prior Publication US 2021/0253790 A1, Aug. 19, 2021
Int. Cl. C08G 64/40 (2006.01); B01D 67/00 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/10 (2006.01); B01D 71/26 (2006.01); B01J 31/12 (2006.01); C08G 64/34 (2006.01)
CPC C08G 64/406 (2013.01) [B01D 67/00931 (2022.08); B01D 69/107 (2022.08); B01D 69/12 (2013.01); B01D 71/10 (2013.01); B01D 71/261 (2022.08); B01D 71/262 (2022.08); B01J 31/12 (2013.01); C08G 64/34 (2013.01); B01D 2311/14 (2013.01); B01D 2325/0283 (2022.08)] 10 Claims
 
1. A method for separating an organic zinc catalyst, the method comprising:
filtering, through a composite filtering membrane, a polyalkylene carbonate resin solution containing a polyalkylene carbonate resin and an organic zinc catalyst,
wherein the composite filtering membrane is a composite material comprising a hydroxyl group-containing material and a polyolefin material,
wherein the composite filtering membrane has a form in which one or both surfaces of the polyolefin material is coated with the hydroxyl group-containing material, and
wherein the hydroxyl group-containing material is coated with a thickness of 10 μm to 10 mm.